package cn.edu.dgut.css.lemon.springbootautoconfigexp02;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.boot.context.event.ApplicationReadyEvent;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.ApplicationEvent;
import org.springframework.context.ApplicationListener;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.event.ApplicationEventMulticaster;
import org.springframework.context.event.SimpleApplicationEventMulticaster;
import org.springframework.context.support.AbstractApplicationContext;
import org.springframework.core.env.Environment;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;
import org.springframework.stereotype.Component;

/**
 * @author Lemon
 * @data 2020-10-24 22:29
 */

@Configuration
@EnableConfigurationProperties(CustomProperties.class)
@ConditionalOnProperty(prefix = "lemon.auto", name = "enable", havingValue = "true")
public class AutoConfig {

    @Bean
    CommandLineRunner commandLineRunner(Environment environment) {
        CustomCommandLineRunner customCommandLineRunner = new CustomCommandLineRunner(environment);
        return customCommandLineRunner;
    }

    /**
     * 事件发布器
     */
    @Bean(AbstractApplicationContext.APPLICATION_EVENT_MULTICASTER_BEAN_NAME)
    ApplicationEventMulticaster customApplicationEventMulticaster(ThreadPoolTaskExecutor taskExecutor) {
        SimpleApplicationEventMulticaster eventMulticaster = new SimpleApplicationEventMulticaster();
        eventMulticaster.setTaskExecutor(taskExecutor);
        return eventMulticaster;
    }

    /**
     * 自定义事件类
     */
    static class NoticeEvent extends ApplicationEvent {
        private static final Logger logger = (Logger) LoggerFactory.getLogger(NoticeEvent.class);

        /**
         * 存储信息
         */
        private final String message;

        public NoticeEvent(String message) {
            super(message);
            this.message = message;
            logger.info("添加事件成功！message：{}", message);
        }

        public String getMessage() {
            return message;
        }
    }

    /**
     * 自定义事件监听器
     */
    @Component
    static class NoticeListener implements ApplicationListener<NoticeEvent> {

        private static final Logger logger = LoggerFactory.getLogger(NoticeListener.class);

        @Override
        public void onApplicationEvent(NoticeEvent noticeEvent) {
            logger.info("事件监听器获取到NoticeEvent，睡眠当前线程2秒...");
            try {
                Thread.sleep(2000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            logger.info("NoticeEvent的message属性是：{}", noticeEvent.getMessage());
        }
    }

    /**
     * 自定义ApplicationReadyEvent的事件监听器
     */
    @Component
    static class ApplicationReadyEventListener implements ApplicationListener<ApplicationReadyEvent> {

        @Override
        public void onApplicationEvent(ApplicationReadyEvent event) {
            System.out.println("After CommandLineRunner");
        }
    }
}


